Bogie for rail vehicles



Oct. 5, 1943. PRANTL BOGIE FOR RAIL VEHICLES 2 Sheets-Sheet 1 Filed Sept. 11, 1940 1943- ,F. PRANTL BOGIE FOR RAIL VEHICLES F-iled Sept. 11, 1940 2 Sheets-Sheet 2 Patented Oct. 5, 1943 I r 4 p v 2330394 nocmrolt RAIL VEHICLES f rianzriantl, Wetting en, Switzerland; assignortb Aktie'ngesellscha'ft Brown Boveri & 'Cie B'aden,

Switzerland, a joint-stock company a a t .Application September 11, 1940, Serial No. 356,402

' IniSwitzerland' September 15; 1-939 12' Claims, (01. 105-190) It is known' with bogies "having one driving-mo; tor to use this with its: axis'lyingiin the direction of travel for the purpose ofstiffeningthe bogie T and to provide it with the pivot. If a swing bolster is employed in order to obtain smoother running and higher speds; this must betlocated above the motor with the resultthat thefloor of the vehicle must be fairly high above-the ground and therefore in an unfavourable position, thevari ous Parts of the bogie being subjected to high stresses. I These disadvantages are overcom according to the inventionwhich makes. it possible toconstructialight and simple .bogie' with-1 low'lying swing bolster and vehicle floor. The invention consists ofco'nnectingtwomotor's whose axes are parallel with the: driving. axles by means -of a rigid transverse channel member so as to form a rigid-body; inside of which'the swings bolster is locat.ed.-. v .o 1 s ,Tw'os constructional, examples'of the, invention areillustrated the: accompanying drawings wherez. Fig. 1 showsalongitudinalsection of bogie along the line A-iA' "ofiFig; 2:

Fig.2 shows-a plan:view;-; 1 1 r I Figr 3, across-section". through the. transverse channel; k y H c vFigpdiairont. elevational' view of the bogie'; I Fig ;sh0wsJ-a modifiedaconstruction in= longitudinaltsectionzp. s I

lInzthe,figures'the'center pin or pivot 'I is cated in a transverse beam 2 of the vehicle floor 3 and is connected to the bogie'bymeans' of two thrustglinks: 4; and 5. arranged at right anglesto each other and provided-,with' ballrjoints. The link 4 transmits the tensile? and compressive forces along. the longitudinaliaxis of thevehicle, Whilezthelink- 5 transmits thesfo'rcesin a transverse direction from, the. bogie tothe vehicle. The bogie consists of theltwo' driving motors 6 which, are rigidly connected by means of the- U- section transversech'annel 1- containing the bolsterbeam 8 and bolster springs 9;. The vehicle chassis'rests on two rollers I 0 on the bolster beam; According to the constructional example illustrated in Figs. 1-4 thebolsteribeam :8=consists of a box-sectioned supporting beam'providedxzwith a pivot l l for the attachment of the link 5i- The beam 8 is supported at-both ends: through shackles [2 by the shackle bolts I4 from the leaf springs 9, these latter beingisecuredin' the centre by the clamping 'pieoes I5? and fastened to the side wallsof the'channel piece 1 .7

. One'of the motorsfifiiied .to the c 'annel l is a vehicle I ings.

provided with a. pivot I 6 to which the longitudinal link 4' is attached; otherwise both motors:ar'e the same. The motors ii are connected to" their respectivedriving axles through a single reduction gearing I1, I flyand universal couplings I9; 20 'which 4 are" movable in' all directions; =In the constructional example illustratedthel motor 6 which is equlpped witha hollow shaft 22', drives throughtworspring disc couplings I9; 2lltheisolid shaft (which is e'nclosedbythe hollow shaft and carries a-pini'on I! located inthegear box 24? The pinion ll meshes with the g'ear-" wheel 18 which is fixed on the driving axle 2|. The'ge'ar box 24 issupported from' the channel by aballjointed link 26 andis rigidly fixed to th axle bearing 2-! atthe opposite end of the drivingaxle 22vby a casing 28. The entire bogie chassis comprising the motors 6, and channel" 1 is supported on four leaf spring bundles 29 by the'driving axle bearings which are each suspended by ball-jointed pivotlinksiio'from' the charmel vl. Inorder to preventlateral movements of theldrivirig=1axle bearings 21 with: respect to the channel's I the rigid casing; which connects the bearings? is connected to the motor housing Gby meansaof a pivot link 3| located parallel to thedriving axle as shown in Fig. 4. The vertical movement. of the driving axles, 2l' relative to the bogie is lim+ ited. by the stops 32 provided onthe motor house With narrow-gauge railways it isgadvisablez' to make the body ofthe driving wheels-25? convex and to locate the inner driving axle bearings in; side'th'e hollowspace thus provided;. Duettothe bogie chassis 6; I and the carriage framework a being supported through the leaf spring 2-9 by the bearings 21 iti'spossible to obtain a short wheel base and to concentrate'the weight at the fulcrum of the'bogie; Y i 1 j The; wheelbase can be still further reduced if the bolster beam 8 is supported one; number of spiral springs 33 insteadof on-transverseleaf springs 9, this modified form of the invention being shown: in Fig; 5. A pair of strong-spiral springs or a number of rubber blocks can be' used for this purpose." When it is desired 'toyhave larger wheel bases, lea'f'springs arranged: parallel with' the longitudinal axis ofthe vehicle can be used to-support the bolster beam Brake blocks; brake rods and electrical- -r'ail brakes can easily be located in the space between the two driving wheels 25. I V

The I ball join't's' for'links 4 5 amaze and: so can be replaced by rubber joints-o1 so-called sile blocks or combined with these; asihdicatedyin the entire bogie and carriage weight to the driv ing axles 2|. The links (Fig 1) and links 3| (Fig. 4) can then be omitted.

The bearings for the driving axlescan also be 1 constructed as ordinary axle bushings the sliding surfaces of which are located on'thebogie'chassis 6, I. Outer bearings can also be used instead of inner bearings. 1

6. A vehicle truck according to claim 1, in which the means for journalling the rigid chassis assembly on the axles includes supporting connecting means between said journal members and said rigid chassis assembly, and a. transverse link pivotally connected at its ends to one of said journal members and to said chassis, respectively, to prevent lateral movement between said chassis and said journal members.

'7. A vehicle truck according to claim 1, in

which the means for journalling the rigid chassis assembly on the axles comprises said journal members -on said axles,- and means including resilient rubber blocks forming a supporting con- Further modifications of the constructional ex amples described above are possible without departing from the spirit of the invention.

The, des'ignof the bogie according to the invention, is verysuitable for light rail vehicles which have to be used on tracks with a smallradius of curvature, particularly tramcars; it can, however, be used equally well fortrackless roadv vehicles.

While preferred illustrative embodiments of. the invention havebeen shown and described,.it. is to be understood that various modifications in the details of constructionandmode ofopera tion maybe resorted'to without departing from the spirit of the invention within thedefinition of the appended claims.

Iclaim: a l

1. A vehicle truck comprising spaced wheeled axles, a transverse channel member disposed intermediate said wheeled axles and. having upstanding side walls extending parallel to said axles, a driving motor rigidly secured to the outside of each of said side walls toform a rigid chassis assemblywith the shafts ofTsaid motors disp ed parallel to said .axles, meansiincluding journal members .on-said axles for;journalling the rigid chassis assembly onv said axles; geared driving. connections between. the respective mo'-' tor shafts and wheel axles, a bolster housed by said channel member between the side -:walls thereof, and m'eansforresiliently suppo ting. said bolster in said channel member.

V 2. Avehicle truck according toclaim .1, in which the resilient support for said bolster comprises a plurality of resilient elements carried by. said channel ,member and mounting said bolster therein. a 3. A vehicletruck according to claim :1, in which the resilient support for said bolster comprises a plurality of coil spring units mounted Within said channel member and mountin said bolster on' the upper ends thereof. a:

4. A vehicle truck according to claim 1,-in'which the means for journalling the rigid chassis assembly on said axles comprises resilient'connecting means supporting said chassis from said journal members on said axles and link members extending in the direction of travel and pivotally connected at their ends tosaidjournal members and channel member, respectively.

5. A vehicle truck according to claiml, in which the means for journalling the rigid chassis assembly on said'axles comprises leaf. spring packets fastenedon said channel. member and bearing at their ends onsaid journal members on said axles, and link members extending in the direction of travel and ,pivotally connected at their ends to said journal members and channel member, respectively.

nection'between said journal members and said chassis.

, 8. A vehicle truck according to claim 1, gear housings enclosing the respective geared driving connections between said motor shafts and wheel axles and rigidly connected to the respective journal members anda rigid. member extending between and connected: to the'gear casing and journal member at the opposite end of each axle,

respectively.

.9. In' a vehicle truck accordingto claim 1, a gear housing. enclosing F the respective geared driving connections between said motor shafts and said axles and. rigidly connected to the respective'journal members, and a pivoted suspension link connecting said gear housing with said chassis assembly.

10. In a truck for. a railvehicle frame havin a center .pin, spaced wheeled axles, a' transverse channel member disposed intermediate said wheeled axles and having upstanding side walls extending parallel to said axles,.a driving motor rigidly secured to the outside of each of said side walls to form a rigid chassis assembly with the shafts of said motors disposed parallel to said axles, means including journal members on saidaxles for journalling the rigid chassis assembly on'said axles,.geared' driving connections between the respective motor shafts and wheel axles, aswing bolster 1 housed'by said channel member between'the sidewalls thereof, means for resiliently supporting said bolster in said channel member, two power transmitting thrust links arranged perpendicularly to each other, one of said links connecting the center pin. of the vehicle body to the chassis formedby said transverse channel member and motorsl'and the other link connecting the center. pin to the swing bolster.

.11. In atruck for a rail vehicle frame having a center pin, spacedwheeled axles, a transverse channel .member. disposed intermediate said Wheeled axles and having upstanding side walls extending parallelto'said axles, a driving motor rigidly secured tothe outside of'each of said side walls to form a rigid chassisassembly with the shafts of :said motors lzdisposed parallel to said axles, means including journal members on said axles for journa'lling the rigid" chassis assembly on said axles, geared driving connections between the respective motor shafts: and wheel axles, a swing bolster house'd by said channel member between the side walls thereof, means for resiliently supporting said bolster in said channel member, two-power transmitting. link members arranged perpendicularly to eachother, one of said link members connecting. the center pin to the chassis formed bysaid transverse channel member and motors andthe othert link member con necting the center pin tothe swing bolster, and roller members journalled; on said swing bolster on each side of the center point thereof for supporting engagement with the vehicle frame.

12. A vehicle truck comprising spaced wheeled axles, a transverse channel member disposed intermediate said wheeled axles and having upstanding side walls extending parallel to said axles, a driving motor rigidly secured to the outside of each of said side walls :to form a rigid chassis assembly with the shafts of said motors disposed parallel to said axles, means including 10 bolster,

journal members on said axles for journalling the rigid chassis assembly on said axles, geared driving connections between the respective motor shafts and wheel axles, a swing bolster housed by said channel member between the side walls thereof, and means for resiliently supporting said bolster in-said channel member comprising a leaf spring member on each side of said swing bolster,

said spring members being fastened centrally thereof to the channel member andxlinked at their ends to the respective ends of said swing FRANZ PRANTL. 

